According to the invention, a reduced set of transport format combinations is signalled to a subscriber station which has established a link to a second radio communication system in a second signalling channel of said second radio communication system. The assembly may include a wear bar for attachment to a bottom of a snow machine ski and one or more hardened inserts, each insert extending outward from the bottom of the wear bar. The array profiles various molecules from both samples at predetermined locations for detection and quantitative comparison. The mobile drive unit is further capable to move the inventory holder when the docking head is coupled to the inventory holder. In order to improve the illumination of a roadway lying in front of an automobile, the controller may take into account a driving profile. A control is provided for controlling start timing of a change of a transfer output of the transferring mechanism in accordance with the humidity so that the output reaches a level effective to transfer the image.